Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current deferred tax assets:
Accrued expenses and allowances	$ 793	$ 733
Deferred revenue	671	549
Other	22	62
Valuation allowance for current deferred tax assets	(1,183)	(964)
Net current deferred tax assets	303	380
Noncurrent deferred tax assets:
Intangible assets		0
Stock compensation	582	350
Net operating loss and tax credit carryforwards	20,871	16,755
Other	174	61
Valuation allowance for noncurrent deferred tax assets	(17,324)	(12,143)
Net noncurrent deferred tax assets	4,303	5,023
Current deferred tax liabilities:
Prepaid expenses	(1)	(1)
Total current deferred tax liabilities	(1)	(1)
Noncurrent deferred tax liabilities:
Stock compensation	0	0
Capital expenses	(2)	(202)
Intangible assets	(6,481)	(7,217)
Goodwill	(561)	(252)
Tax credit carryforwards	(379)	(737)
Total noncurrent deferred tax liabilities	(7,423)	(8,408)
Net current deferred tax asset	302	379
Net noncurrent deferred tax liability	(3,120)	(3,385)
Net deferred taxes	$ (2,818)	$ (3,006)